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The FBI is investigating a large cyberattack on the Premera health insurance company after concerns that personal and financial information of nearly 11 million customers has been compromised, ABC News reports.

Premera said there’s no evidence yet that data was used “inappropriately.”

The company discovered the “sophisticated attack” nearly seven weeks ago and quickly learned that the hacking began in May 2014. The FBI was immediately notified, the company and bureau said.

“Cybercrime remains a significant threat and the FBI will continue to devote substantial resources and efforts to bringing cyber criminals to justice,” FBI spokesman Joshua Campbell said in a statement.

Premera is beginning to warning customers of the breach.

“[T]he attackers may have gained unauthorized access to members’ information, which could include members’ name, date of birth, Social Security number, mailing address, email address, telephone number, member identification number, bank account information, and claims information, including clinical information,” Premera said in its statement. “Individuals who do business with Premera and provided the company with their email address, personal bank account number, or Social Security number are also affected.”